di3 - a new procedure for absolute directional measurements

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ID: 247464
2011
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Ranked #238 of 292 articles by views in Proceedings of the National Academy of Sciences of the United States of America

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Abstract
The standard observatory procedure for determining a geomagnetic field's declination and inclination absolutely is the DI-flux measurement. The instrument consists of a non-magnetic theodolite equipped with a single-axis fluxgate magnetometer. Additionally, a scalar magnetometer is needed to provide all three components of the field. Using only 12 measurement steps, all systematic errors can be accounted for, but if only one of the readings is wrong, the whole measurement has to be rejected. We use a three-component sensor on top of the theodolites telescope. By performing more measurement steps, we gain much better control of the whole procedure: As the magnetometer can be fully calibrated by rotating about two independent directions, every combined reading of magnetometer output and theodolite angles provides the absolute field vector. We predefined a set of angle positions that the observer has to try to achieve. To further simplify the measurement procedure, the observer is guided by a pocket pc, in which he has only to confirm the theodolite position. The magnetic field is then stored automatically, together with the horizontal and vertical angles. The DI3 measurement is periodically performed at the Niemegk Observatory, allowing for a direct comparison with the traditional measurements.
Reference Key
geese2011datadi3 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;A Geese;U Auster;M Korte
Journal Proceedings of the National Academy of Sciences of the United States of America
Year 2011
DOI
10.2481/dsj.IAGA-08
URL
http://datascience.codata.org/articles/96
Keywords Keywords not found

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